not entirely true i have a series 1 block and has a hole where the oil feed is, even feels tappered, but does not have a bolt in it as it obviously does not go right through to the oil resovoir, but the oil drain spot is just a blanked area is the main give away.

I got an oil drain pipe for the bottom of the turbo, which can be sourced from ebay, appropriate size fitting for the block (from a fitting place, pritec/enzed), I can't remember exactly but I think it is 3/4" thread to block and 1/2" hose end, and then sourced a hose for oil with a 90° bend and cut to fit.